| 摘要 |
In a deflection circuit suitable for a television receiver, a controllable switch (Q1) operated at the horizontal deflection rate is coupled to a horizontal deflection winding (LH) to generate scanning current during a trace interval of a deflection cycle. A deflection retrace capacitor (CRD1, CRD2) forms a retrace resonant circuit (25) with the deflection winding (LH) during the retrace interval. A supply inductance such as a winding (W1') of a horizontal output transformer (T) is coupled either conductively or magnetically to a generator (50) of supply energy. A second capacitor (CRT) is coupled to the supply inductance (W1') and to the controllable switch (Q1) and forms a second resonant circuit (30) with the supply inductance within the retrace interval to generate a pulse voltage. The pulse voltage energizes a load circuit such as the ultor high voltage circuit (31). A modulation inductance (T2) is coupled to a source (Q2) of modulation signals and to the deflection winding (LH) and supplies a modulation current to the retrace resonant circuit (25) to modulate the amplitude of the scanning current without modulating the amplitude of the supply inductance pulse voltage. The modulation may occur at a vertical rate to provide east-west pincushion distortion correction. <IMAGE> |
